Electric cut-out.



T. E. MURRAY. ELECTRIC CUT-OUT. APPLICATION IILED JUNE 16, 1910.

Patented Sept. 13, 1910.

4 SHEETS-SHEET 1.

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T. E. MURRAY. ELECTRIC GUT-OUT. APPLICATION FILED JUNE 16, 1910.

970,088. Patented Sept. 13,1910.

4 SHEETS-SHEET 2.

F Q 11 7;? r 4 fly, 3 E 14 f6- 17 vwevtfoz T. E. MURRAY. ELECTRICGUT-OUT. APPLIGATION FILED JUNE 16, 1910.

Patented Sept. 13, 1910.

4 SHEETSSHEET 4.

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THOMAS E. MURRAY, on NEW YORK, N. Y.

ELECTRIC cor-our.

Application filed June 16, 1910. Serial No. 567,130.

Specification of Letters Patent.

Patented Sept. 13, 1910.

To all whom 'it mag concern:

Be it known. that I, THOMAS E. MURRAY,

v a citizen of the United States, residing at New York, in the county ofNew York and by the fuse holder is inserted and removed from the baseblock, whereby said fuse holder is rotated to cut the fuses therein intoor out of circuit, whereby said fuse holder is locked in the base blockwith the fuseseither in or out of circuit as may be desired, whereby theblowing of one of the two main fuses isprevented from affecting theother fuse, and whereby the blowing of either or both main fuses isindicated by tell-tale fuses so arranged as to avoid the necessity ofopening the fuse holder to elxamine said main fuses. t

The invention further consists in the details of construction moreparticularly pointed out in the claims.

In the accompanying drawings-Figure 1 is an end elevation of my improvedcut-out, F ig. 2 is a top view. Fig. 3 is a vertical section on the line3, 3, of Fig. 4. Fi. 4 is a horizontal section on the line 4, 4, 0 Fig.3, showing the fuse plug in the position shown in Fig. 3, closingcircuit through the fuses. Fig. 5 is a similar section showing the fuseplug in reversed position to cut out the fuses. Fig. 6 is a verticalsection of the fuse plug on the line 6, 6, of Fig. 9. Fig. 7 is asimilar section on the line '2', 7 of Fig. 9. Fig. 8 is a transversevertical section of the fuse plug on the line 8, 8, of Fig. 9. Fig. 9 isa bottom view of the fuse plug. Fig. 10 is a perspective view of thefuse plug, with the operating lever removed, and Fig. 11 is aperspective view of the base block.

Similar numbers and letters of reference indicate like parts. a

The base block A- is preferably of porcelain or other refractoryinsulating material and is made in a single piece. It is provided withfour sockets B, C, D, E, in which are disposed pairs of spring clips.Each clip comprises two upwardly extending metal arms 11, 12, Fig. 3,formed integrally with a connecting bottom plate .13, which on one sidehas an extension 14 bent over to form spring parallel to the connectingportion 13. The clips in sockets B, E are disposed at right angles tothe clips in sockets C, D. The terminals of one potential conductor a,Fig. 11, of a three wire system are connected respectively to the clipsB, C by bolts, as 15, Fig. 3, suitable openings being made in the endwalls of'the block; the terminals of the other otential conductor b areconnected respectively to the clips D, E; the terminals of the neutralconductor 0 are connected to the ends of a metal strip 16 seated in arecess on the under side of block A. The several clips are secured inthe sockets B, C, D, E, by means of screws 17 countersunk in recesses,also on the under side of the block.

The fuse plu F is in the form of a half cylinder, provi ed on its flatside with four cubical projections G, H, I, J, which enter respectivelythe sockets B, G, E, D. The plug is internally divided into two chambersK, L by the inserted .partition M, also of porcelain. To each projectionG, H, I, J

.is secured a metal contact plate, which extends across the bottom ofthe projection and up on two opposite sides thereof. The contact plates18, 19 on projections G, I are at right angles to-the contact plates 20,21 on projections H, J On contact plates 18, 19 are flanges'22,.23 ,andon contact plates 20, 21 are flanges 24, 25, said flanges, as shown inFig. 7 ,lying against the under side of the.

semi-cylindrical portion of the fuse plug. The inner sides of theprojections G, H, 1, J are channeled, as shown in Figs. 4 and 5,

and through these channels pass the main.

fuse strips N, O. The fuse strip N is connectedat its ends to thecontact plates 18 and 20 on projections G, H and arches over in thechamber K. The fuse strip 0 is connected at its ends to the contactplates 19, 21 onprojections I, J and arches over in the chamber L. Thespace within the two chambers inclosing the arched portions of fuses N,O is to be filled with a pulverized refractory insulating material, suchas magnesia. The remainder of said space and the channels in theprojections are preferably filled with plaster of paris P in plasticstate, which, on hardening, embeds the fuse and also forms a cover orretaining wall which prevents escape of the pulverized material. In theupper surface of the block A, outside of the sockets B, C, D, E, areseated two additional fuse wires or strips R, S disposed relativelyparallel and each having one end turned at right angles. The extremitiesof said strips may be bent downwardly and inserted in openings in thebase block, as shown at T, Fig. 11, so as to hold said strips in place.The location of said strips is such, as that when the projections on theplug are inserted in the sockets, as shown in Fig. 4the projection Gthen entering the recess Bthe flanges 22, 23, 24, 25 on the contactplates on said projections will touch said strips, for the purposehereafter explained.

Pivoted in lugs 26 on the upper side of block A are links 27 which arepivoted at their upper ends to the arms of a bifurcated lever 28,provided with an operating handle 29.

Extending across the arch of the fuse plug F is a bar 30, the ends ofwhich are bent over so as to enter recesses in the sides of said plug,as shown in Fig. 10. From the middle point of said bar rises a pin 31,threaded at its upper end to receive a threaded disk 32 and a nut 33.Upon the pin is placed a sleeve 34, having studs 35 on each side, bymeans of which said. sleeve is pivoted between the arms of lever 28.Secured at one end to disk 32, and at the other end to sleeve 34, is ahelical spring 36, Fig. 1, the normal eflect of which, when wound, is torotate the pin 31 in the sleeve 34, and so to turn the plug F on the pin31 as an axis.

Between the arms of lever 28 is pivoted a shaft which carries a latch37, which is operated by the lever 38. Said latch, by means of the leafspring 39, is normally held in engagement with one or the other of twonotches 40, 41, formed in the fuse plug. Depending from the latch shaftare arms 42, connected by a cross bar which on one side has a hook 43which engages under a nut 44 on the upwardly projecting threaded pin 46,which is secured in the base block A. The nut 44 may be prevented fromturning in any suitable way: as here shown, it is provided with anupward projection 45, through which passes one part of a wire loop 49,

both parts of which extend through an opening in a projection 47 on theother side of the bar connecting arms 42. The two ends of the loop areconnected by any suitable seal 48.

The operation of the entire device is as follows: Under normalconditions, the projections on the plug F are inserted in the basesockets, so that the project-ion Gr enters the socket B, as shown inFig. 4. Circuit is then made from both potential conductors through themain fuses N, O; and by reason of the flanges 22, 24 meeting theauxiliary fuse R, and the flanges 23, 25 meeting the auxiliary fuse S,said auxiliary fuses are brought into parallel with the main fuses. Asthe projections enter the sockets they force down the springs 14 on thebottom plates 13 of clip ar ms 11, 12, good electrical connectionbetween said springs and the contact plates on said projections beingthus secured. The lever 28 is then locked in position, by carrying thehook 43 under the nut 44 which is screwed down, and revented from beingturned backward by means of the loop wire 49 and seal 48. \Vhen it isdesired to cut the fuses out of circuit, the seal 48 on loop wire 46 isbroken and the lever 28 is raised. WVhen the projections rise clear ofthe sockets, the latch lever 38 is pressed down, causing the latch 37 torise from the notch 41, and thus permitting the plug F to be turned bythe spring 36 a half revolution on the pin 31 as an' axis. The latchthen engages in notch 40. The lever 28 is then depressed to insert theprojections again in the sockets, but by reason of the half revolution,the plug will have been reversedend for end, the projection J enteringthe socket B, and the position being as shown in Fig. 5. Circuit throughboth the main fuses N, O and the auxiliary fuses R, S is thus broken.The lever 28 is finally locked in place in the manner already described,the seal fastening preventing any unauthorized raising of the lever andconse quent access to the plug again to establish circuit.

In case of the blowing-of either fuse N, O, the corresponding auxiliaryfuse R or S will also be blown. Hence the fuses R, S serve astell-tales, from which the condition of the main fuses can be seenwithout opening the fuse plugs.

I claim:

1. An electric cut-out comprising a base having two pairs of sockets andcircuit terminals therein, a removable fuse plug, a partition dividingsaid plug into two compartments, a fuse in each compartment, projectionson said plug, and contactplates on'said projections, to which plates theends of said fuses are connected; the said projections entering saidsockets to close circuit through said terminals and plates to saidfuses. I I

2. An electric cut-out comprising a base having two pairs of sockets andpairs of clip arms forming circuit terminals therein, a removable fuseplug, a. partition dividing said plug into two compartments, a fuse ineach compartment, projections on said plug, and contact plates on saidprojections, to

which plates the ends of said fuses are connected; the said contactplates on said projections being placed with reference to the clip armsin said sockets so that when the projections are inserted in saidsockets circuit shall be closed through said fuses, and when the plug isreversed end for end and the projections again inserted in said sockets,circuit through said fuses shall be opened.

8. An electric cut-out comprising a base, a fuse plug supported'thereon, circuit termi- ..nals on said base and plug, relatively soreversing said plug.

4. An electric cut-out comprising a base, a fuse plug supported thereon,circuit terminals on said base and plug, relatively so disposed thatcircuit through the plug may be broken by reversing said plug end forend, a device for lifting said plug from said base, means on saidliftingdevice for 'reversing said plug, and a latch engaging said plug.

5. An-electric'cut-out comprising a base, a fuse plug supported thereon,circuit terminals on said base and plug, relatively so disposed thatcircuit through the plug may be broken by reversing said plug end forend, a device for lifting said plug from 'said base, and lockingmechanism for preventing the operation of said device-- 6. An electriccut-out comprising a base,

a fuse plug supported thereon, circuit terminals on said base and plug,relatively so disposed that circuit through the plug may be broken byreversingsaid plug end for end, a lever pivoted on said base for liftingsaid plug therefrom, a sleeve on said lever, a pin on said pluggenteringsaid sleeve, a helical spring connected to said pin and to said sleevefor rotating said plug on said pin as an axis, and a latch on said leverengaging'said plug. T 7. An electric cut-out comprising a base havingsockets and horizontal spring circuit terminals at the bottoms thereof,a fuse plug, projections on said plug entering said sockets, contactplates on the bottoms of said projections, a device on said base formoving said plug into said sockets against theresiliency of said springterminals, and means for securing said inserted plug in place. l

8, An electric cut-out comprising a base having sockets and horizontalspring circuit terminals at the bottoms thereof, a fuse plug,projections on said plug entering said sockets, contact plates on thebottoms of said projections, a pivoted lever on said base connected tosaid plug for moving said plug into said sockets against the resiliencyof said spring terminals, and means for locking said lever to hold saidinserted plug in place. n j

9. An electric cut-out comprising a base having two pairs of sockets andcircuit terminals therein, a removable fuse plug, projections on saidplug, contact plates on said evopas minals therein, a removable fuseplug, projections on said plug, contact plates on said projections, andfuses on said plug connected to said plates, the said'contact platesbeing placed with reference to said terminals so that when theprojections are inserted in said sockets circuit shall be closed throughsaid fuses, and when the plug is reversed end for end and theprojections again inserted in said sockets, circuit throu h said fusesshall be'opened: a device for li ting said fuse from said base, areleasable holdlng means for preventing rotation of said plug, and meanson said lifting device for reversing said plugupon the release of saidholding means.

11. An electric cut out comprising a support, circuit terminals thereon,an auxiliary fuse, and a removable main fuse plug closing circuitbetween said terminals and through said auxiliary fuse.

12. An electric cut-out comprising a base having sockets and circuitterminals therein, an auxiliary fuse on said base, and a removable fuseplug entering said sockets and closing circuit between said terminalsand through said -auxiliary fuse.

13. An electric cut-out comprises a. base THOMAS E. MURRAY.

Witnesses:

GERTRUDE T. PORTER, MAY MCGARRY.

